Improvement in railroad safety-brakes



I D. POHLM'AN.

Car Brake.

Nag 3%} I Patented Mar. 19, 1861.

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NFETERS. PHOTWLITHQGRAPHER, WASHINGTON D C UNITED STATES PATENT OFFICE.

DANIEL POHLMANN, OF BALTIMORE, MARYL AND.

Specification forming part of Letters Patent No. 3! ,737, dated March 19, 186i.

' To all whom, it may concern:

Be it known that LDANIEL POHLMANN, of Baltimore, in the county of Baltimore and State of Maryland, have invented a new and useful Improvement in Railroad Safety- Brakes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, forming part of this specification,in the several figures of which similar characters of reference denote the same part.

Figure 1 represents a locomotive and car with my improved safety -,,,brake attached. Fig. 2 is a view of the bottom of the same. Fig. 3 is a perspective view of the truck-frame constructed as desired, and also shows the construction of the sliding rods. Fig. i is a perspective view of the shoe-frame.

The nature of my invention consists of a shoe-frame suspended by means of slidingrod connections, said rods passing through truck-frames, which slide upon the shoe: frames when said shoe-frames fall upon the rails, the rod connection receiving its movement through the engineer or automatically, as hereinafterto be set forth; and the object of the same is to obtain a safety railroad-car brake in a simple and eflectual manner.

In the drawings, A, Fig. 3, represents an ordinary truck-frame provided at its four corners with jaws a, said frame being secured to the car, as at b. Moving through the upper portions of said frame are the sliding rod's c, constructed with projecting portions (1 d.

B, Fig. 4, represents a shoe-frame, provided with shoes e, which rest upon the rails 70 when said frame is allowed to fall.

ff are dovetailed pendants, through which pass the rods 0, and when the projections cl of said rods remain in said dovetails it causes the shoe-frames to have the position shown in Fig. 1. These frames have their sides U shaped as shown at Fig. 4, and are constructed with the openings g, in which sets the truckframe A, the jaws a of which overlappingthe sides 0, as shown in Figs. land 2.

h is a hooked rod, held in position, as shown, by "movable pin 2'.

m is a lip secured to wheel 0, and thereby receives a rotary movement.

G represents an apparatus which, through the action of the cow-catcher, will cause the withdrawal of the projections 61 from the dovetails f, and thereby cause the shoe-frame to fall upon the rail.

The operation of my improved safety-brake is as follows: The several parts have the position, as shown in Figs. 1 and 2, when the train is in motion and there is no desire to brake the same. Vhen it is desired to prevent the movement of cars the engineer, by means of suitable mechanism, causes the with drawal of the pin t', when the hooked rod it falls andis caught by the lip m and isdrawn forward, together with its several rod connections, and thereby effects the withdrawalv of-the projections cl from the dovetailsf, causing the shoe-frames to fall upon the rails and the truck-frames to slide upon the inclinest of the same, and thereby elevating the car from the track and effectually preventing the movement of the train.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The shoe-frames B, in combination with the sliding rod 0, having supporting projections d d and truck-frame A, the whole constructed, arranged, and operating substantially as and for the purposes set forth.

In testimony whereof I have hereunto signed my name before two subscribing witnesses.

DANIEL POHLMANN. 

